Grinding machine for forming rolls



Feb. "12 1924.-

- 1,483,859 I C. H. NORTON GRINDING MACHINE FOR FORMING ROLLS Filed Jan. 5, 2

bar es H. Norm CHAR/LE3 H. NQRTON, F WOECESTER, MASSACHUSETTS, ASSIGNOR TO NORTON COM- PANY, OF WORCESTER,.MASSACHUSETTS, A COREOBAI'IO'N OF MASSACHUSETTS.

GRINDING MACHINE FOR FORMING ROLLS.

Application filed January 5, 1921. Serial No. 435,098.

To all u-lmm 7'2 may concern.

Be it known that T, CHARLES H. Non'roN, a citizen of the l 'nited States of America, residing at 'orcester, in the county of Worcester" and State of Massachusetts,

have invented certain new and useful Improvements in Grinding Machines for Forming Rolls, of which the following is a full, clear. and exact specification. 10 My invention relates to cylindrical grind ing machines of the type shown, for examplev in my Patent No. 762,838, dated June 14, 1 904, andmore particularly to a roll forming attachment for such machines.

Forming attachments have heretofore been used in connection with the relatively movable work tables of cylindrical grinding machines which caused one table to move transversely of the other while they were traversed past the grinding wheel, thereby giving the work the desired form. In some instances it-has been .g roposed to swivel the work-carrying table on the longitiidinally sliding table adjacent one end thereof and to provide a finger adjacent the opposite end of the swivel table, this finger bearing against a templet or forming bar supported on brackets on the base of the machine. Such a device is, however, unsuited for pro ducing accurate work, where the work has to be ground to within a thousandth of an inch of a given diameter, because of the tendency to push the traversing table transversely off the ways on the base, said ways being usually one flat and the other V-shaped.

It is accordingly a principal object of my invention to overcome such dithculties by providing a grinding machine with a forming attachment in which the forces causing relative movement between the tables act between the tables, thereby eliminating this tendency to push the sliding table off the ways and the consequent inaccuracies in the work. To this end I may employ a longitudinally reciprocating table carrying a transversely movable table, said tables bearingcooperating opposed follower members adapted to engage a forming bar fixed as regards longitudinal movement and extending between said members.

It is a minor object of my invention to provide a pivotal connection between the tables xnich reduces lost motion and friction to a minimum and to provide for the adjustment of said follower members towards each other, whereby the work may he held steady and brought into parallelism, with the table ways. v

With the foregoing and other objects in view which will become apparent as thedescription proceeds, the invention consists in the combination and arrangement of parts and in the details of construction herein after described and claimed, it being understood that changes in the precise embodi ment of the invention as herein disclosed may be made without departing from the spirit of the invention.

Referring to the accompanying drawings which are made a part hereof and in which similar reference characters refer to similar parts.

Figure l is a front elevation of a grind ing machine equipped with my improved forming attachment;

Fig. 2 is a plan View of the work table showing the device applied thereto;

Fig. 3 is an enlarged fragmentary sectional view through the roller carrying brackets, lower table, and base, taken approximately on the line 3-3 of Fig. 4 and showing a table driving mechanism:

Fig. 4. is a fragmentary plan of the parts shown in Fig. 3, excluding the table driving mechanism; Y r

Fig. 5 is an enlarged transverse vertical sectional view through the pivotal connection betweenjthe tables; I

Fig. 6 is a horizontal section through the pivot, taken approximately on the line 6-6 Q" of Fig. 5, parts of the table being broken away; and Fig. 7 is a fragmentary sectional. detail v view showing the manner of mounting of the spring which forces the rollers at the 95 opposite end of the tables into contactiwith the forming bar. 1 A

In the specific embodiment of my inven-" iion selected for illustration, I have shown my device applied to a grinding machine of the Norton type, as shown in the patent above referred to, and in which the work table 1 is mounted to slide longitudinally on the usual ways on the base 2 and is pro vided with the usual means for traversing it either by hand or automatically, as is full described in said prior patent. In Fig. 3 have shown only the hand traversing means, which consists of a rack 3 rigidly connected to the under side of the table 1 and driven from the hand wheel 4 through the gearing 5, shaft 6 and pinion 7, the latter engagingthe teeth of the rack. On the table 1 is mounted the transversely movable table 10 which may be of the usual swivel construction except as modified for the purposes of my invention, On the table 10 are mounted the headstock 11 and tailstock 12 which may be of? any suitable construction for supporting and rotating the work. Where the work comprises a heav roll '13 having end bearings 14, I preferab y support it in work supports 15 with or without the use of the tailstook and rotate it by having its squared end 16 engage a similarly shaped opening 17 in a driven member 18 on the headstock 11. I have shown the latter as b ing motor driven in a manner similar to that shown in my Patent No; 1,152,434, dated September 7 1915. I do not desire to be limited to the specific manner of supporting and rotating the work which is merely illustrative and forms no part of the present invention.

In order to effect a relative transverse movement between the tables 1 and 10 while the work is traversing past the grinding wheel 19 to give the desired form to the work, I provide opposed follower members I such as the rollers 20 and 21 between which configuration and these rollers are held is supported a forming bar 22 of desired against the opposite sides of the bar by any suitable means such as the spring 23. In the present instance Ihave shown my device adapted for fcrowning rolls and the rollers are arranged adjacent one end of the tables whilethe table 10 is swivelled on a pin or roll 24. The forming bar may be tapered from end to end so as to produce. a paraboloid. It is supported by a block 25 (Figs.

3 and 4) between the-rollers and a bracket 26 (Fig. 1) extending upwardly from the base. The bar is pivoted to this bracket to allow swinging movement thereof. Toprovide for the ready substitutionof different bars, I may connect the bar asby screws 28 to a short arm 29 which is in turn pivoted 'at 27 to the bracket 26.

' :331118 rollers are preferably mounted on silbs'tantiaily vertical pivots'arranged in op popccl relation at the right-l-iand end of the tab esas shown in Figsl and 2. The inner roller 20 is' located in .a downwardly opening recess 30 formed in; a bracket 31. which is preferably 'reniovablysecured to the end of the swivelftable 10 as by screws A headed stud 33 supports {the roller and serves as a pivot pin therefor. I have shown this stud securely held as-by. set screws 34 inaholexn'ithe bracket 31. The outcrroller 21 is shown supported in a'br'acket 351suitably'connected to the table 1.- I'hav'e shown it formed integrallywith the tableto provideh rigid construction and vtoicnder its v.manmhwture easy. {An upwardly opening recess 36 is provided in this bracket to receive the roller 21 and a hole is provided in the bradket below said recess and opening thcreinto to receive the lower .end of the stud 38 on which the roller is pivoted. he upper end of said stud extends into a hole 39 formed in a top .plate 40 closing the recess in the bracket and'secured thereto by screws 41.

ing it with a squared portion 43 for engagement with a suitable tool for rotating it. Rotation of the stud will obviously shift the axis of rotation of the roller 21. provide this stud between the squared por- I may tion 43 and the to plate 40 with a tapered collar 44 provide with graduations 45 cooperating with a suitable index 46 on the top plate for indicating the'amount of lat-.

eral movement of the roller axis and consequently of the end of the swivel table.

When once adjusted, the stud is locked in place by suitable clamping screws 47.

As a means for moving the tables land 10 relatively to cause the rollers 26 and 21 to bear against the forming bar at all times during the grinding operation,'I may employ a stiff helical. spring 23'bearing with one end against an upwardly extending bracket 50 on the table 1 and with its other 1 end against the side of the table 10 adjacent one end thereof. The ends of the spring are held in place by suitable studs 51. and 52'secured to the tables 1 and 10 respectively. To allow of adjusting the tension of the spring, I provide the stud 51 with a relatively long screw threaded portion 53 engaging ascrew threaded hole in the bracket 50 and provide its outwardly extending end with a hexagonal or otherwise shaped head 54 suitable for receiving a wrench to turn it. A clamping screw 55 is" provided to lock it in place.

I have discovered that the ordinary pive otal connection consisting of a stud on one table engaging in a hole on the other is unsuitable for accurate work in connection with my work forming device. I therefore utilize a special pivotal connection which minnmzes'frlction and eiiectually avoids lost motion. This device may consist of opposed bearingblocks having V-shaped recesses 58' and 59, thebearing blocks being arranged vrespectively on the tablesl and 10 and receiving between thorn.theliardenedroll 24,

I l tables].

, face of the roll is curved uniformly from ,as' is clearly .shownin Figs; 5 and 6. The V-shaped recesses are arranged to face toward the front and the rear of the machine respectively. and there is suilicient clearance .4 between the blocks to allow of thedesired "-flalnount -'of -pivotal movement between the end to end, a 'templet or forming bar 22 having a straight taper from end to end, as

'- is shown in Fig. 2, is then utilized. The "15 table 1 is first moved to bring one end of the roll, let us say the left-hand end, Figs. 1 andQ, opposite the grinding wheel and the grinding Wheel is fed into contact with the roll by the usual feeding mechanismim dicated fat 61, Fig. 1, If the roll is cylindrical and its axisis parallel with the path of reciprocation or the ways of the table 1 when the grinding wheel is opposite the longitudinal center of the roll, then with the parts in the positionfirst supposed, the lefthand end of the roll is nearer to the grinding wheel axis than the right-hand end. As the table is traversed to the left from this position, the swivel table is swun by the tato table ways when thewheel is opposite the center of the roll and from thereon the roll axis will incline in the opposite directouches the roll at the right-hand end. The

grinding is then continued until the wheel as ground the entire surface of the roll and the roll has reached the desired dimensions. If the roll axis shouldhappen to be slightly out of alignment with the table ways, andthis can be determined by calipering the opposite ends of the roll after they have'both been ground to some extent, in which case they will be of difierent'diameters, it will be necessary to eflect some adjustment to bring about correct alignment. ,This is conveniently accomplished in my device by applying a wrench to the s uared portion of the stud on which the ro er 21 is eccentrically pivoted and moving the pivot either toward or away from the axis of the roll as may be required toleffect the neces- .sary alignment. .1

By thi'sconstruction I havd provided a very precise and reliable formin attachment. for a plain cylindrical grinding machine which can be readilychan ed toadapt it for grinding cylindrical wor of various contours, such asconvex, concave, sinuous 50 or straight cylindrical work, as may be dey sired. It also enables me to readily convert 5a plain cylindrical grinding machine, such as is shown in my prior patent above referred to, into a machine for grinding formed work by substituting the tables pered bar until the work axis is parallelto tion tothe table ways until the wheel again .movement and extending between said folequipped with my form grinding attachment for the usual tables shown in the patant, and fastening the forming bar in proper position on the base.

' Having thus described my invention, what I claim as new and desire to secure by Letters Patent is: In the operation of my machine, suppos-' ing that it is desired to grind a roll with a given amount of crown and so that the sur- 1. Agrinding machine comprising a base, a reciprocable table mounted thereon, means for reciprocating said table, a transversely movable table on said reciprocable table, and means including a follower on eachof said tablesand a forming bar held against longitudinal movement and extending between said followers to move the tables transversely relative to each other as they reciprocate.

2-. A grinding machine comprising a base, a reciprocable table mounted thereon, .a swivelled table on said reciprocable table, means for reciprocating said tables, opposed followers on said tables respectively, means-acting-to move one of said. followers towards the other, and a longitudinally stationary forming bar extending between said followers for controlling the movement of said tables relativeto each otheras they reciprocate.

3. A grinding machine comprising a base, a reciprocable table mounted thereon, means for reciprocating said table, a transversely movable table mounted on said reciprocable table,work-s'upporting means on said transversely movable table, a grinding element adaited for operative engagement with the wor ,and means including a follower on each of said tables and a formi bar mounted to swing transversely but eld against longitudinal movement and extending between said followers to move the upper table transversely as it reciprocates.

4. A grinding machine comprising a base a'table mounted for recipr ation on sai base, a second table mount d on said reciprocable table for pivotal movement about u a point between its ends, opposed followers on said tables respectively and arranged adjacent one end thereof, .a forming bar pivoted .on. said base to allow transverse H5 lowers, and means adjacent the opposite end of said tables for relatively holding the followers in engagement with the opposite sides of the bar in all operative positions thereof. I Y

5. A grinding machine comprising a base, a reciprocable table mounted thereon, means for reciprocating said table,qa second table mounted for transverse movement on said reciprocable tab1e, brackets fastened-to said tables at transversely opposite points, rollers mounted on said brackets in substantially the same horizontal lane, resilient means urging one of said rol ere towards the other means for adjusting the tension of ,mi

resilient means, and a forming bar extending between said rollers and engaged by said rollers on opposite sides thereof, said forming bar being relatively stationary while the tables reciprocate. B

6. A grinding machine comprising a base,

a reciprocable table mounted thereon, mean tor reciprocating said table, a second table mounted on said reciprocable table lorpivot al n'iovoment about a point substantially midway of its length, rollers mounted on said tables adjacent one end thereof, a forming: bar stationar as regards longitudinal movement and n'ojecting between said rollers, and spring means adjacent the opposite end of said tables for causing the pivoted table to swing about its pivot to hold the rollers against the opposite sides of said bar.

7. A grinding machine comprising abase, a reciprocable table mounted thereon,- a transversely movable table on said reciprocating table, a pair of opposed followers on said tables. a torn'iing bar fixed as regards longitudinal movement and extending bemesses tween said followers, means to move said trans ersely movable table to holdsaid fol w'ers in engagement with opposite sides 'iI the forming, bar, and means for adjusting one of said followers in a direction towards or from the other.

8. A grinding machine comprising a base,

adjusted towards or away from the other by I rotation of its pivot, and the work axis may be placed in parallelism with the path of reciprocation of the table.

Signed at Worcester, Massachusetts, this I 3rd dayof Jan, 1921.

' CHARLES H. NORTOJ. 

